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authorIlya Dryomov <idryomov@gmail.com>2015-05-15 12:02:17 +0300
committerIlya Dryomov <idryomov@gmail.com>2015-06-25 11:49:29 +0300
commita319bf56a617354e62cf5f774d2ca4e1a8a3bff3 (patch)
treecf54ed20b02c8488a342f54fd573eb57df964a3c /net/ceph/ceph_common.c
parentd50c97b566c5bbf990eff472e9feaa58fdebdd33 (diff)
downloadlinux-a319bf56a617354e62cf5f774d2ca4e1a8a3bff3.tar.xz
libceph: store timeouts in jiffies, verify user input
There are currently three libceph-level timeouts that the user can specify on mount: mount_timeout, osd_idle_ttl and osdkeepalive. All of these are in seconds and no checking is done on user input: negative values are accepted, we multiply them all by HZ which may or may not overflow, arbitrarily large jiffies then get added together, etc. There is also a bug in the way mount_timeout=0 is handled. It's supposed to mean "infinite timeout", but that's not how wait.h APIs treat it and so __ceph_open_session() for example will busy loop without much chance of being interrupted if none of ceph-mons are there. Fix all this by verifying user input, storing timeouts capped by msecs_to_jiffies() in jiffies and using the new ceph_timeout_jiffies() helper for all user-specified waits to handle infinite timeouts correctly. Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Reviewed-by: Alex Elder <elder@linaro.org>
Diffstat (limited to 'net/ceph/ceph_common.c')
-rw-r--r--net/ceph/ceph_common.c41
1 files changed, 31 insertions, 10 deletions
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 79e8f71aef5b..a80e91c2c9a3 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -352,8 +352,8 @@ ceph_parse_options(char *options, const char *dev_name,
/* start with defaults */
opt->flags = CEPH_OPT_DEFAULT;
opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
- opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
- opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */
+ opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT;
+ opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;
/* get mon ip(s) */
/* ip1[:port1][,ip2[:port2]...] */
@@ -439,13 +439,32 @@ ceph_parse_options(char *options, const char *dev_name,
pr_warn("ignoring deprecated osdtimeout option\n");
break;
case Opt_osdkeepalivetimeout:
- opt->osd_keepalive_timeout = intval;
+ /* 0 isn't well defined right now, reject it */
+ if (intval < 1 || intval > INT_MAX / 1000) {
+ pr_err("osdkeepalive out of range\n");
+ err = -EINVAL;
+ goto out;
+ }
+ opt->osd_keepalive_timeout =
+ msecs_to_jiffies(intval * 1000);
break;
case Opt_osd_idle_ttl:
- opt->osd_idle_ttl = intval;
+ /* 0 isn't well defined right now, reject it */
+ if (intval < 1 || intval > INT_MAX / 1000) {
+ pr_err("osd_idle_ttl out of range\n");
+ err = -EINVAL;
+ goto out;
+ }
+ opt->osd_idle_ttl = msecs_to_jiffies(intval * 1000);
break;
case Opt_mount_timeout:
- opt->mount_timeout = intval;
+ /* 0 is "wait forever" (i.e. infinite timeout) */
+ if (intval < 0 || intval > INT_MAX / 1000) {
+ pr_err("mount_timeout out of range\n");
+ err = -EINVAL;
+ goto out;
+ }
+ opt->mount_timeout = msecs_to_jiffies(intval * 1000);
break;
case Opt_share:
@@ -512,12 +531,14 @@ int ceph_print_client_options(struct seq_file *m, struct ceph_client *client)
seq_puts(m, "notcp_nodelay,");
if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT)
- seq_printf(m, "mount_timeout=%d,", opt->mount_timeout);
+ seq_printf(m, "mount_timeout=%d,",
+ jiffies_to_msecs(opt->mount_timeout) / 1000);
if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT)
- seq_printf(m, "osd_idle_ttl=%d,", opt->osd_idle_ttl);
+ seq_printf(m, "osd_idle_ttl=%d,",
+ jiffies_to_msecs(opt->osd_idle_ttl) / 1000);
if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT)
seq_printf(m, "osdkeepalivetimeout=%d,",
- opt->osd_keepalive_timeout);
+ jiffies_to_msecs(opt->osd_keepalive_timeout) / 1000);
/* drop redundant comma */
if (m->count != pos)
@@ -627,7 +648,7 @@ static int have_mon_and_osd_map(struct ceph_client *client)
int __ceph_open_session(struct ceph_client *client, unsigned long started)
{
int err;
- unsigned long timeout = client->options->mount_timeout * HZ;
+ unsigned long timeout = client->options->mount_timeout;
/* open session, and wait for mon and osd maps */
err = ceph_monc_open_session(&client->monc);
@@ -643,7 +664,7 @@ int __ceph_open_session(struct ceph_client *client, unsigned long started)
dout("mount waiting for mon_map\n");
err = wait_event_interruptible_timeout(client->auth_wq,
have_mon_and_osd_map(client) || (client->auth_err < 0),
- timeout);
+ ceph_timeout_jiffies(timeout));
if (err == -EINTR || err == -ERESTARTSYS)
return err;
if (client->auth_err < 0)